本文選題：磁性活性炭 + 桉葉殘渣　； 參考：《廣西大學》2015年碩士論文

【摘要】：吸附法去除水中污染物受到大量研究學者的關注。因傳統(tǒng)吸附劑(如活性炭等)難以從處理后的廢水中實現(xiàn)固液分離,其實際應用受到限制。將吸附劑賦磁并應用于水中污染物的去除是一個相對較新的領域,利用磁場來分離磁性吸附劑,具有省時、價廉、安全、高效等優(yōu)點。本文將廣西大量種植的尾葉桉樹葉提取桉葉油后的廢渣,通過化學共沉淀法制成磁性活性炭(Magnetic Eucalyptus Leaf Residue Biochar, MELRBC),應用于水中Cr離子的去除,考察影響吸附的各種因素以及磁分離效果,并將吸附—磁分離聯(lián)用技術用于實際含鉻電鍍廢水的處理,初步探討其在含鉻電鍍廢水處理方面的應用潛力。主要結論如下：(1)賦磁后,活性炭理化性質發(fā)生改變。共沉淀生成的鐵氧化物(主要為Fe304)有選擇地分布在活性炭表面,其平均粒徑為22 nm；活性炭的C含量由原來的46.2%變?yōu)?8.4%,比表面積和微孔容積均有所下降,但中孔容積有所上升,總孔容積變化不大；表面增加了Fe-O官能團；MELRBC飽和磁化率為16.12 emu g-1。(2) Cr (Ⅵ)吸附受磁化過程、溶液pH、共存離子、時間以及溫度影響。MELRBC的Cr (Ⅵ)、TCr去除率相比活性炭有少量減少；溶液pH越低,Cr (Ⅵ)的去除率越高；共存Cu(Ⅱ)以及Ni (Ⅱ)離子的存在能促進Cr (Ⅵ)的吸附；MELRBC去除Cr(Ⅵ)的過程可以分為2個階段：吸附的前30 min快速吸附階段以及去除率緩慢增加并逐漸達到平衡階段；溫度的升高會延長吸附反應平衡時間,但能提高Cr (Ⅵ)的去除率。(3)磁性炭對Cr (Ⅵ)的吸附包含化學及物理吸附Freundlich以及Sips等溫模型、偽二級動力學模型能較好地描述磁性炭去除Cr (Ⅵ) TCr的過程；磁性炭對Cr(Ⅵ)的吸附過程主要包括靜電吸附、絡合反應以及氧化還原作用。(4) MELRBC含量以及溶液pH會影響磁分離效果。為達到同一分離效果,混合液中磁性炭含量越大,所用的磁分離時間越長；溶液pH越低,磁分離效果越差,但當pH達到3以上時,磁分離受pH影響不再顯著。(5) NaOH對負載Cr的吸附劑的脫附效果較好。240 min后,Cr (Ⅵ)以及TCr脫附率均達到80%以上,且無Fe溶出；增大NaOH濃度對脫附的影響不大；脫附最佳固液比(吸附劑/再生液)為160 g L-1。(6)MELRBC能有效處理高濃度的含鉻電鍍廢水。Cr(Ⅵ)和總鉻(TCr)的去除率均大于97%,其他共存離子幾乎完全去除；磁分離10 min后,其混合液濁度為21.8 NTU；在與原吸附劑投加量相同的條件下,利用再生吸附劑處理電鍍廢水時,Cr(Ⅵ)以及TCr去除率僅少量降低,共存離子Ni (Ⅱ)、 Cu (Ⅱ)的去除率以及磁分離效果相差不大。
[Abstract]:The removal of pollutants from water by adsorption method has attracted much attention from many researchers.The practical application of traditional adsorbents (such as activated carbon) is limited because it is difficult to separate solid from treated wastewater.It is a relatively new field to apply magnetic adsorbent to remove pollutants in water. Using magnetic field to separate magnetic adsorbent has the advantages of saving time, low price, safety, high efficiency and so on.In this paper, the waste residue of eucalyptus leaves from a large number of cultivated eucalyptus leaves in Guangxi was extracted from eucalyptus oil, and magnetic activated carbon (Eucalyptus Leaf Residue Biocharr, MELRBC) was prepared by chemical coprecipitation method. It was applied to the removal of Cr ions in water. The factors affecting adsorption and the magnetic separation effect were investigated.The adsorption-magnetic separation technology was applied to the treatment of chromium-containing electroplating wastewater, and its application potential in the treatment of chromium-containing electroplating wastewater was preliminarily discussed.The main conclusions are as follows: 1) after magnetization, the physical and chemical properties of activated carbon are changed.The iron oxides formed by coprecipitation (mainly Fe304) were selectively distributed on the surface of activated carbon with an average particle size of 22 nm, the C content of activated carbon changed from 46.2% to 38.4%, the specific surface area and micropore volume decreased, but the mesoporous volume increased.The total pore volume changed little, the saturated magnetic susceptibility of Fe-O functional group Mel RBC was 16.12 emu g-1.2Cr (鈪，

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